/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is confidential property of Nordic
 * Semiconductor ASA.Terms and conditions of usage are described in detail
 * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 * $$
 */

/** @file
 *
 * @defgroup ble_sdk_app_proximity_main main.c
 * @{
 * @ingroup ble_sdk_app_proximity
 * @brief Proximity Sample Application main file.
 *
 * This file contains is the source code for a sample proximity application using the
 * Immediate Alert, Link Loss and Tx Power services.
 *
 * This application would accept pairing requests from any peer device. This implementation
 * will not know whether a connected master is a known device or not.
 *
 * It demonstrates the use of fast and slow advertising intervals.
 */

#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "nrf_assert.h"
#include "nrf_error.h"
#include "nrf_gpio.h"
#include "nrf51_bitfields.h"
#include "ble.h"
#include "ble_srv_common.h"
#include "ble_advdata.h"
#include "ble_tps.h"
#include "ble_ias.h"
#include "ble_lls.h"
#include "ble_bas.h"
#include "ble_conn_params.h"
#include "ble_nrf6310_pins.h"
#include "ble_sensorsim.h"
#include "ble_stack_handler.h"
#include "app_timer.h"
#include "ble_bondmngr.h"


#define ALERT_LEVEL_MILD_LED_PIN_NO     NRF6310_LED_2                  /**< Is on when we are in Mild Alert state. */
#define ALERT_LEVEL_HIGH_LED_PIN_NO     NRF6310_LED_3                  /**< Is on when we are in High Alert state. */
#define ADV_INTERVAL_SLOW_LED_PIN_NO    NRF6310_LED_4                  /**< Is on when we are doing slow advertising. */

#define DEVICE_NAME                     "PRX_APPV0.1"                  /**< Name of device. Will be included in the advertising data. */
#define APP_ADV_INTERVAL_FAST           0x0028                         /**< Fast advertising interval (in units of 0.625 ms. This value corresponds to 25 ms.). */
#define APP_ADV_INTERVAL_SLOW           0x0C80                         /**< Slow advertising interval (in units of 0.625 ms. This value corrsponds to 2 seconds). */
#define APP_ADV_TIMEOUT_IN_SECONDS      180                            /**< The advertising timeout in units of seconds. */
#define ADV_INTERVAL_FAST_PERIOD        30000                          /**< The duration of the fast advertising period (in milli seconds). */

#define BATTERY_LEVEL_MEAS_INTERVAL     2000                           /**< Battery level measurement interval (milliseconds). */
#define MIN_BATTERY_LEVEL               81                             /**< Minimum simulated battery level. */
#define MAX_BATTERY_LEVEL               100                            /**< Maximum simulated battery level. */
#define BATTERY_LEVEL_INCREMENT         1                              /**< Increment between each simulated battery level measurement. */

#define MIN_CONN_INTERVAL               ((1 * 800) / 2)                /**< Minimum connection interval (0.5 seconds). */
#define MAX_CONN_INTERVAL               (1 * 800)                      /**< Maximum connection interval (1 second). */
#define SLAVE_LATENCY                   0                              /**< Slave latency. */
#define CONN_SUP_TIMEOUT                (4 * 100)                      /**< Connection supervisory timeout (4 seconds). */
#define FIRST_CONN_PARAMS_UPDATE_DELAY  (20 * 1000)                    /**< Time from initiating event (connect or start of notification) to first time ble_gap_conn_param_update is called (15 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   (5 * 1000)                     /**< Time between each call to ble_gap_conn_param_update after the first (5 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3                              /**< Number of attempts before giving up the connection parameter negotiation. */

#define SEC_PARAM_TIMEOUT               60                             /**< Timeout for Pairing Request or Security Request (in seconds). */
#define SEC_PARAM_BOND                  1                              /**< Perform bonding. */
#define SEC_PARAM_MITM                  0                              /**< Man In The Middle protection not required. */
#define SEC_PARAM_IO_CAPABILITIES       BLE_GAP_IO_CAPS_NONE           /**< No I/O capabilities. */
#define SEC_PARAM_OOB                   0                              /**< Out Of Band data not available. */
#define SEC_PARAM_MIN_KEY_SIZE          7                              /**< Minimum encryption key size. */
#define SEC_PARAM_MAX_KEY_SIZE          16                             /**< Maximum encryption key size. */

#define INITIAL_LLS_ALERT_LEVEL         BLE_CHAR_ALERT_LEVEL_NO_ALERT  /**< Initial value for the Alert Level characteristic in the Link Loss service. */
#define TX_POWER_LEVEL                  (-8)                           /**< TX Power Level value. This will be set both in the TX Power service, in the advertising data, and also used to set the radio transmit power. */

static ble_tps_t                        s_tps;                         /**< Structure used to identify the TX Power service. */
static ble_ias_t                        s_ias;                         /**< Structure used to identify the Immediate Alert service. */
static ble_lls_t                        s_lls;                         /**< Structure used to identify the Link Loss service. */
static ble_bas_t                        s_bas;                         /**< Structure used to identify the battery service. */
static ble_gap_sec_params_t             s_sec_params;                  /**< Security requirements for this application. */
static bool                             s_is_advertising = false;      /**< Variable to keep track of when we are advertising. */

static ble_sensorsim_cfg_t              s_battery_sim_cfg;             /**< Battery Level sensor simulator configuration. */
static ble_sensorsim_state_t            s_battery_sim_state;           /**< Battery Level sensor simulator state. */


static void on_ias_evt(ble_ias_t * p_ias, ble_ias_evt_t * p_evt);
static void on_lls_evt(ble_lls_t * p_lls, ble_lls_evt_t * p_evt);
static void advertising_start(bool fast_advertising);


/**@brief Assert macro callback function.
 *
 * @details This function will be called if the ASSERT macro fails.
 *
 * @param[in]   line_num   Line number of the failing ASSERT call.
 * @param[in]   file_name  File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * file_name)
{
    // Copying parameters to static variables because parameters are not accessible in debugger
    static volatile uint8_t  s_file_name[128];
    static volatile uint16_t s_line_num;

    strcpy((char *)s_file_name, (const char *)file_name);
    s_line_num = line_num;
    UNUSED_VARIABLE(s_file_name);
    UNUSED_VARIABLE(s_line_num);
    
    nrf_gpio_pin_set(ASSERT_LED_PIN_NO);

    for (;;)
    {
        // Loop forever. On assert, the system can only recover on reset
    }
}


/**@brief Service error handler.
 *
 * @details A pointer to this function will be passed to each service which may need to inform the
 *          application about an error.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void service_error_handler(uint32_t nrf_error)
{
    ASSERT(false);
}


/**@brief Advertising Interval Change timer timeout handler.
 *
 * @details This function will be called each time the Advertising Interval Change timer expires.
 *
 * @param[in]   timer_id   Id of timer that has expired.
 */
static void adv_interval_change_timeout_handler(app_timer_id_t timer_id)
{
    ASSERT(timer_id == APP_TIMER_ADV_INTERVAL_CHANGE);
    advertising_start(false);
}


/**@brief Start advertising.
 */
static void advertising_start(bool fast_advertising)
{
    uint32_t             err_code;
    ble_gap_adv_params_t adv_params;
    
    // If we are already advertising, stop it
    if (s_is_advertising)
    {
        err_code = ble_gap_adv_stop();
        if (err_code != NRF_SUCCESS)
        {
            ASSERT(false);
        }
    }

    // Start advertising
    memset(&adv_params, 0, sizeof(adv_params));
    
    adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
    adv_params.p_peer_addr = NULL;
    adv_params.fp          = BLE_GAP_ADV_FP_ANY;
    adv_params.interval    = (fast_advertising) ? APP_ADV_INTERVAL_FAST : APP_ADV_INTERVAL_SLOW;
    adv_params.timeout     = APP_ADV_TIMEOUT_IN_SECONDS;

    err_code = ble_gap_adv_start(&adv_params);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
    s_is_advertising = true;
    
    nrf_gpio_pin_set(ADVERTISING_LED_PIN_NO);
    nrf_gpio_pin_write(ADV_INTERVAL_SLOW_LED_PIN_NO, !fast_advertising);
    
    // If we are starting fast advertising, start timer for switching to slow advertising
    if (fast_advertising)
    {
        err_code = app_timer_start(APP_TIMER_ADV_INTERVAL_CHANGE,
                                   adv_interval_change_timeout_handler,
                                   ADV_INTERVAL_FAST_PERIOD,
                                   APP_TIMER_MODE_SINGLE_SHOT,
                                   APP_TIMER_LOWEST_PRI);
        if (err_code != NRF_SUCCESS)
        {
            ASSERT(false);
        }
    }
}


/**@brief Perform battery measurement, and update Battery Level characteristic in Battery Service.
 */
static void battery_level_update(void)
{
    uint32_t err_code;
    uint8_t  battery_level;
    
    battery_level = (uint8_t)ble_sensorsim_measure(&s_battery_sim_state, &s_battery_sim_cfg);
    
    err_code = ble_bas_battery_level_update(&s_bas, battery_level);
    if (
        (err_code != NRF_SUCCESS)
        &&
        (err_code != NRF_ERROR_INVALID_STATE)
        &&
        (err_code != BLE_ERROR_NO_TX_BUFFERS)
        &&
        (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
    )
    {
        ASSERT(false);
    }
}


/**@brief Battery measurement timer timeout handler.
 *
 * @details This function will be called each time the battery level measurement timer expires.
 *
 * @param[in]   timer_id   Id of timer that has expired.
 */
static void battery_level_meas_timeout_handler(app_timer_id_t timer_id)
{
    ASSERT(timer_id == APP_TIMER_BATTERY_LEVEL_MEAS);
    battery_level_update();
}


/**@brief LEDs initialization.
 *
 * @details Initializes all LEDs used by this application.
 */
static void leds_init(void)
{
    GPIO_LED_CONFIG(ADVERTISING_LED_PIN_NO);
    GPIO_LED_CONFIG(CONNECTED_LED_PIN_NO);
    GPIO_LED_CONFIG(ASSERT_LED_PIN_NO);
    
    GPIO_LED_CONFIG(ALERT_LEVEL_MILD_LED_PIN_NO);
    GPIO_LED_CONFIG(ALERT_LEVEL_HIGH_LED_PIN_NO);
    GPIO_LED_CONFIG(ADV_INTERVAL_SLOW_LED_PIN_NO);
}


/**@brief Initialize the buttons used by this application.
 */
static void buttons_init(void)
{
    // Set Button 0 as wakeup source
    GPIO_PIN_CONFIG(NRF6310_BUTTON_0, 
                    GPIO_PIN_CNF_DIR_Input, 
                    GPIO_PIN_CNF_PULL_Disabled, 
                    GPIO_PIN_CNF_DRIVE_S0S1, 
                    GPIO_PIN_CNF_SENSE_Low);
                    
    // Set Button 1 as wakeup source
    GPIO_PIN_CONFIG(NRF6310_BUTTON_1, 
                    GPIO_PIN_CNF_DIR_Input, 
                    GPIO_PIN_CNF_PULL_Disabled, 
                    GPIO_PIN_CNF_DRIVE_S0S1, 
                    GPIO_PIN_CNF_SENSE_Low);

}


/**@brief Read the state of the input pin. 
 * @param[in]   pin_number   Number of the pin to be read.
 * @details Although the function nrf_gpio_pin_read does exactly what this function does,
 *          this function is defined and used by this application because this app needs to 
 *          read the button states even when the soft device is not enabled. 
 *          
 */
static __INLINE uint32_t gpio_pin_read(uint32_t pin_number)
{
    return  ((NRF_GPIO->IN >> pin_number) & 1UL);  
}


/**@brief Timer initialization.
 *
 * @details Initializes the timer module. This creates and starts application timers.
 */
static void timers_init(void)
{
    uint32_t err_code;

    // Initialize timer module
    err_code = app_timer_init(NULL);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
    
    // Start battery measurement timer
    err_code = app_timer_start(APP_TIMER_BATTERY_LEVEL_MEAS, 
                               battery_level_meas_timeout_handler, 
                               BATTERY_LEVEL_MEAS_INTERVAL, 
                               APP_TIMER_MODE_REPEATED, 
                               APP_TIMER_LOWEST_PRI);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief GAP initialization.
 *
 * @details This function shall be used to setup all the necessary GAP (Generic Access Profile)
 *          parameters of the device. It also sets the permissions and appearance.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
    
    err_code = ble_gap_device_name_set(&sec_mode, DEVICE_NAME);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }

    err_code = ble_gap_appearance_set(BLE_APPEARANCE_GENERIC_KEYRING);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
    
    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = ble_gap_ppcp_set(&gap_conn_params);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }

    err_code = ble_gap_tx_power_set(TX_POWER_LEVEL);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Advertising functionality initialization.
 *
 * @details Encodes the required advertising data and passes it to the stack.
 *          Also builds a structure to be passed to the stack when starting advertising.
 */
static void advertising_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    uint8_t       flags = BLE_GAP_DISC_MODE_LIMITED | BLE_GAP_DISC_BR_EDR_NOT_SUPPORTED;
    int8_t        tx_power_level = TX_POWER_LEVEL;
    
    ble_uuid_t adv_uuids[] = 
    {
        {BLE_UUID_TX_POWER_SERVICE,        BLE_UUID_TYPE_BLE}, 
        {BLE_UUID_IMMEDIATE_ALERT_SERVICE, BLE_UUID_TYPE_BLE}, 
        {BLE_UUID_LINK_LOSS_SERVICE,       BLE_UUID_TYPE_BLE}
    };

    // Build and set advertising data
    memset(&advdata, 0, sizeof(advdata));
    
    advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance      = true;
    advdata.flags.size              = sizeof(flags);
    advdata.flags.p_data            = &flags;
    advdata.p_tx_power_level        = &tx_power_level;
    advdata.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);
    advdata.uuids_complete.p_uuids  = adv_uuids;
    
    err_code = ble_advdata_set(&advdata, NULL);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize Tx Power Service.
 */
static void tps_init(void)
{
    uint32_t       err_code;
    ble_tps_init_t tps_init_obj;

    memset(&tps_init_obj, 0, sizeof(tps_init_obj));
    tps_init_obj.initial_tx_power_level = TX_POWER_LEVEL;
    
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&tps_init_obj.tps_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&tps_init_obj.tps_attr_md.write_perm);

    err_code = ble_tps_init(&s_tps, &tps_init_obj);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize Immediate Alert Service.
 */
static void ias_init(void)
{
    uint32_t       err_code;
    ble_ias_init_t ias_init_obj;

    memset(&ias_init_obj, 0, sizeof(ias_init_obj));
    ias_init_obj.evt_handler = on_ias_evt;
    
    err_code = ble_ias_init(&s_ias, &ias_init_obj);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize Link Loss Service.
 */
static void lls_init(void)
{
    uint32_t       err_code;
    ble_lls_init_t lls_init_obj;

    // Initialize Link Loss Service
    memset(&lls_init_obj, 0, sizeof(lls_init_obj));
    
    lls_init_obj.evt_handler         = on_lls_evt;
    lls_init_obj.error_handler       = service_error_handler;
    lls_init_obj.initial_alert_level = INITIAL_LLS_ALERT_LEVEL;
    
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&lls_init_obj.lls_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM(&lls_init_obj.lls_attr_md.write_perm);

    err_code = ble_lls_init(&s_lls, &lls_init_obj);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize Battery Service.
 */
static void bas_init(void)
{
    uint32_t       err_code;
    ble_bas_init_t bas_init_obj;
    
    memset(&bas_init_obj, 0, sizeof(bas_init_obj));
    
    bas_init_obj.evt_handler          = NULL;
    bas_init_obj.support_notification = true;
    bas_init_obj.p_report_ref         = NULL;
    bas_init_obj.initial_batt_level   = 100;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init_obj.battery_level_char_attr_md.cccd_write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init_obj.battery_level_char_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&bas_init_obj.battery_level_char_attr_md.write_perm);

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init_obj.battery_level_report_read_perm);
    
    err_code = ble_bas_init(&s_bas, &bas_init_obj);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Initialize services that will be used by the application.
 */
static void services_init(void)
{
    tps_init();
    ias_init();
    lls_init();
    bas_init();
}


/**@brief Initialize the battery sensor simulator.
 */
static void sensor_sim_init(void)
{
    s_battery_sim_cfg.min          = MIN_BATTERY_LEVEL;
    s_battery_sim_cfg.max          = MAX_BATTERY_LEVEL;
    s_battery_sim_cfg.incr         = BATTERY_LEVEL_INCREMENT;
    s_battery_sim_cfg.start_at_max = true;
    
    ble_sensorsim_init(&s_battery_sim_state, &s_battery_sim_cfg);
}


/**@brief Initialize security parameters.
 */
static void sec_params_init(void)
{
    s_sec_params.timeout      = SEC_PARAM_TIMEOUT;
    s_sec_params.bond         = SEC_PARAM_BOND;
    s_sec_params.mitm         = SEC_PARAM_MITM;
    s_sec_params.io_caps      = SEC_PARAM_IO_CAPABILITIES;
    s_sec_params.oob          = SEC_PARAM_OOB;  
    s_sec_params.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
    s_sec_params.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
}


/**@brief Connection Parameters module error handler.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    ASSERT(false);
}


/**@brief Initialize the Connection Parameters module.
 */
static void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;
    
    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATTS_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = true;
    cp_init.evt_handler                    = NULL;
    cp_init.error_handler                  = conn_params_error_handler;
    
    err_code = ble_conn_params_init(&cp_init);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Signals alert event from Immediate Alert or Link Loss services.
 *
 * @param[in]   alert_level  Requested alert level.
 */
static void alert_signal(uint8_t alert_level)
{
    switch (alert_level)
    {
        case BLE_CHAR_ALERT_LEVEL_NO_ALERT:
            nrf_gpio_pin_clear(ALERT_LEVEL_MILD_LED_PIN_NO);
            nrf_gpio_pin_clear(ALERT_LEVEL_HIGH_LED_PIN_NO);
            break;

        case BLE_CHAR_ALERT_LEVEL_MILD_ALERT:
            nrf_gpio_pin_set(ALERT_LEVEL_MILD_LED_PIN_NO);
            nrf_gpio_pin_clear(ALERT_LEVEL_HIGH_LED_PIN_NO);
            break;

        case BLE_CHAR_ALERT_LEVEL_HIGH_ALERT:
            nrf_gpio_pin_clear(ALERT_LEVEL_MILD_LED_PIN_NO);
            nrf_gpio_pin_set(ALERT_LEVEL_HIGH_LED_PIN_NO);
            break;
            
        default:
            break;
    }
}


/**@brief Immediate Alert event handler.
 *
 * @details This function will be called for all Immediate Alert events which are passed to the
 *          application.
 *
 * @param[in]   p_ias  Immediate Alert stucture.
 * @param[in]   p_evt  Event received from the Immediate Alert service.
 */
static void on_ias_evt(ble_ias_t * p_ias, ble_ias_evt_t * p_evt)
{
    switch (p_evt->evt_type)
    {
        case BLE_IAS_EVT_ALERT_LEVEL_UPDATED:
            alert_signal(p_evt->params.alert_level);
            break;
            
        default:
            break;
    }
}


/**@brief Link Loss event handler.
 *
 * @details This function will be called for all Link Loss events which are passed to the
 *          application.
 *
 * @param[in]   p_lls  Link Loss stucture.
 * @param[in]   p_evt  Event received from the Link Loss service.
 */
static void on_lls_evt(ble_lls_t * p_lls, ble_lls_evt_t * p_evt)
{
    switch (p_evt->evt_type)
    {
        case BLE_LLS_EVT_LINK_LOSS_ALERT:
            alert_signal(p_evt->params.alert_level);
            break;
            
        default:
            break;
    }
}


/**@brief Application's BLE Stack event handler.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t        err_code = NRF_SUCCESS;
    static uint16_t s_conn_handle = BLE_CONN_HANDLE_INVALID;
    
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            nrf_gpio_pin_set(CONNECTED_LED_PIN_NO);
            nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);
            nrf_gpio_pin_clear(ADV_INTERVAL_SLOW_LED_PIN_NO);
            app_timer_stop(APP_TIMER_ADV_INTERVAL_CHANGE);
            s_is_advertising = false;
            s_conn_handle = p_ble_evt->evt.gatts_evt.conn_handle;
            err_code = ble_gap_authenticate(s_conn_handle, &s_sec_params);
            break;
            
        case BLE_GAP_EVT_DISCONNECTED:
            nrf_gpio_pin_clear(CONNECTED_LED_PIN_NO);
            s_conn_handle = BLE_CONN_HANDLE_INVALID;
            advertising_start(true);
            break;
            
        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            err_code = ble_gap_sec_params_reply(s_conn_handle, 
                                                BLE_GAP_SEC_STATUS_SUCCESS, 
                                                &s_sec_params);
            break;

        case BLE_GAP_EVT_TIMEOUT:
            if (p_ble_evt->evt.gap_evt.params.timeout.src == BLE_GAP_TIMEOUT_TYPE_ADVERTISEMENT)
            { 
                nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);
                nrf_gpio_pin_clear(ADV_INTERVAL_SLOW_LED_PIN_NO);
                
                err_code = ble_bondmngr_on_goto_system_off();
                if (err_code != NRF_SUCCESS)
                {
                    ASSERT(false);
                }

                // Go to system-off mode (this function will not return; wakeup will cause a reset)
                err_code = nrf_power_system_off();    
            }
            break;
            
        default:
            break;
    }

    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Dispatches a BLE stack event to all modules with a BLE stack event handler.
 *
 * @details This function is called from the BLE Stack event interrupt handler after a BLE stack
 *          event has been received.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 */
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    uint32_t err_code;
    
    err_code = ble_bondmngr_on_ble_evt(p_ble_evt);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }

    ble_conn_params_on_ble_evt(p_ble_evt);
    ble_ias_on_ble_evt(&s_ias, p_ble_evt);
    ble_lls_on_ble_evt(&s_lls, p_ble_evt);
    ble_bas_on_ble_evt(&s_bas, p_ble_evt);
    on_ble_evt(p_ble_evt);
}


/**@brief BLE stack initialization.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code = ble_stack_handler_init(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, ble_evt_dispatch);
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Bond Manager initialization.
 */
static void bond_manager_init(void)
{
    uint32_t err_code;

    // Clear all bonded masters if the "non-connectable advertisement start" button is pushed
    if (gpio_pin_read(NRF6310_BUTTON_1) == 0)
    {
        ble_bondmngr_master_delete();
    }
    
    // Initialize the Bond Manager
    err_code = ble_bondmngr_init();
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Power manager.
 */
static void power_manage(void)
{
    uint32_t err_code = nrf_wait_for_app_event();
    if (err_code != NRF_SUCCESS)
    {
        ASSERT(false);
    }
}


/**@brief Application main function.
 */
int main(void)
{
    // Initialize
    leds_init();
    buttons_init();
    bond_manager_init();
    ble_stack_init();
    timers_init();
    gap_params_init();
    advertising_init();
    services_init();
    sensor_sim_init();
    conn_params_init();
    sec_params_init();
    advertising_start(true);
    
    // Enter main loop
    for (;;)
    {
        power_manage();
    }
}

/** 
 * @}
 */
